A disposable dual-action reciprocating pump part includes a piston and a cylinder, and multiple silicone O-rings. The piston is configured to move bi-directionally inside the cylinder. The multiple silicone O-rings are configured to seal the piston against the cylinder.

A disposable dual-action reciprocating pump part includes a piston and a cylinder, and multiple silicone O-rings. The piston is configured to move bi-directionally inside the cylinder. The multiple silicone O-rings are configured to seal the piston against the cylinder.

A combined piston structure for a compressor includes a first piston ring, a second piston ring, an expandable ring, a guide ring, and a piston. A side of the first piston ring has a slit defined as a first cut. An upper end of an outer surface of the first piston ring is provided with an annular protruding portion. A side of the second piston ring has a slit defined as a second cut. A side of the expandable ring has a slit defined as a third cut. The guide ring is annular and made of a self-lubricating material having a low friction coefficient. A side of the guide ring has a V-shaped opening. An upper end of an outer surface of the piston is provided with an annular first groove. An annular second groove is disposed below the first groove.

The invention provides a rod packing that is capable of minimizing the leakage of a fluid, by fully maintaining its contact state with a shaft at a shaft seal part even when the rod packing abrades and even when it expands/contracts due to a temperature change. In one surface of a ring member, a plurality of incision grooves incised in a radial direction from an inner peripheral edge up to an appropriate position and those incised from an outer peripheral edge to an appropriate position are alternately formed, and in the other surface, incision grooves continuing from the inner peripheral edge up to the outer peripheral edge are formed. In order to adapt to the expansion and the contraction due to a temperature change and a change in shape and dimension due to abrasion, the inner incision grooves and the outer incision grooves increase/decrease in width, causing the packing to expand/contract in the circumferential direction, so that the rod packing is capable of maintaining its

The invention provides a rod packing that is capable of minimizing the leakage of a fluid, by fully maintaining its contact state with a shaft at a shaft seal part even when the rod packing abrades and even when it expands/contracts due to a temperature change. In one surface of a ring member, a plurality of incision grooves incised in a radial direction from an inner peripheral edge up to an appropriate position and those incised from an outer peripheral edge to an appropriate position are alternately formed, and in the other surface, incision grooves continuing from the inner peripheral edge up to the outer peripheral edge are formed. In order to adapt to the expansion and the contraction due to a temperature change and a change in shape and dimension due to abrasion, the inner incision grooves and the outer incision grooves increase/decrease in width, causing the packing to expand/contract in the circumferential direction, so that the rod packing is capable of maintaining its

The present invention relates to a sealing element and/or guide ring manufactured from a composition comprising: i) 50% to 98% by weight of polytetrafluoroethylene and/or modified PTFE, ii) 1% to 49% by weight of perfluoroalkoxy polymer and iii) 1% to 49% by weight of an inorganic filler selected from the group comprising charcoal, graphite, glass fibers, carbon fibers, molybdenum disulfide, metals such as copper, alloys such as bronze, ceramic particles such as aluminum oxide and any desired mixtures of two or more of the aforementioned substances.

The present invention relates to a sealing element and/or guide ring manufactured from a composition comprising: i) 50% to 98% by weight of polytetrafluoroethylene and/or modified PTFE, ii) 1% to 49% by weight of perfluoroalkoxy polymer and iii) 1% to 49% by weight of an inorganic filler selected from the group comprising charcoal, graphite, glass fibers, carbon fibers, molybdenum disulfide, metals such as copper, alloys such as bronze, ceramic particles such as aluminum oxide and any desired mixtures of two or more of the aforementioned substances.

A sealing ring includes a first sealing element having a first mating surface and a second sealing element having a second mating surface. A high-pressure boundary extends across at least a portion of the first sealing element and across at least a portion of the second sealing element, and a low-pressure boundary extends across at least a portion of the first sealing element and across at least a portion of the second sealing element. The first mating surface, the second mating surface, or both, includes a recess open to the low-pressure boundary and not open to the high-pressure boundary. The recess may include a groove, for example. The first mating surface is sealed against the second mating surface by a first force acting on the first sealing element and a second force acting on the second sealing element. These forces act to pressure-lock the assembly.

A sealing ring includes a first sealing element having a first mating surface and a second sealing element having a second mating surface. A high-pressure boundary extends across at least a portion of the first sealing element and across at least a portion of the second sealing element, and a low-pressure boundary extends across at least a portion of the first sealing element and across at least a portion of the second sealing element. The first mating surface, the second mating surface, or both, includes a recess open to the low-pressure boundary and not open to the high-pressure boundary. The recess may include a groove, for example. The first mating surface is sealed against the second mating surface by a first force acting on the first sealing element and a second force acting on the second sealing element. These forces act to pressure-lock the assembly.

An osmotic delivery system is disclosed for delivering an active agent formulation to a fluid environment. The osmotic delivery system typically comprises a reservoir having a lumen that contains the active agent formulation and an osmotic agent formulation and a piston assembly positioned in the lumen to isolate the active agent formulation from the osmotic agent formulation. The piston assembly typically comprises a body constructed and arranged for positioning in the lumen. The body is typically made of a polymeric material that is, for example, resistant to leaching in an organic solvent. In one embodiment, the body is a columnar body having a rim at a distal end thereof for engaging and sealing against a wall of the reservoir and the piston assembly further comprises a spring retained at the distal end of the columnar body for biasing the rim of the columnar body against the wall of the reservoir.